content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.observable.internal.operators;
  
  import java.util.concurrent.*;
  
  import io.reactivex.common.exceptions.Exceptions;
  import io.reactivex.common.internal.functions.ObjectHelper;
  import io.reactivex.observable.*;
  import io.reactivex.observable.internal.observers.DeferredScalarDisposable;
  
  public final class ObservableFromFuture<T> extends Observable<T> {
      final Future<? extends T> future;
      final long timeout;
      final TimeUnit unit;
  
      public ObservableFromFuture(Future<? extends T> future, long timeout, TimeUnit unit) {
          this.future = future;
          this.timeout = timeout;
          this.unit = unit;
      }
  
      @Override
      public void subscribeActual(Observer<? super T> s) {
          DeferredScalarDisposable<T> d = new DeferredScalarDisposable<T>(s);
          s.onSubscribe(d);
          if (!d.isDisposed()) {
              T v;
              try {
                  v = ObjectHelper.requireNonNull(unit != null ? future.get(timeout, unit) : future.get(), "Future returned null");
              } catch (Throwable ex) {
                  Exceptions.throwIfFatal(ex);
                  if (!d.isDisposed()) {
                      s.onError(ex);
                  }
                  return;
              }
              d.complete(v);
          }
      }
  }
  